Sometimes when I idle, car shakes a bit

[DryBear]

<div class='quotetop'>QUOTE(210gtz99)</div><div class='quotemain'>ok, ive got a 99 gtz with 115,000 ive had it since it had 30,000 miles and for the most part it has alwayz had a bit of a studder at idle in park or N...
more recenly however it has started to studder pretty bad whenever i come to a complete stop from highway speed....could this be the idle air control valve??</div>

This is just a guess, but the same thing happened to my Caravan until I changed out the spark plugs - maybe something to consider?

[clone2020]

I've replaced...

Spark Plugs
Wires
PCV
all vacuum hoses
Cleaned Throttle Body...

Here's the thing...

It ONLY happens if I don't let the car warm up enough.

Example: I start the car and drive it to work (takes me less than 10 minutes). I work for 4 hours and then take my lunch break. When I start my car, it's OK. The very next stop light, it vibrates.

I just think it's normal now because I don't drive it long enough after a cold overnight start.

It has never happened after I drive my car for more than 30 minutes.

-MIKE.